The guiding idea of this analysis concerns the development of social innovation theory on the paradigmatic basis of the social interaction concept. The aims of the discussion are three-fold. First, the central task is to elaborate on a multidimensional concept of social innovation, defined as organized social change. Second, the development of the social innovation concept is used to evaluate the heuristic potentials of the sociological paradigm of social interaction. Third, the paradigm of social interaction and its capacities to guide the structuration, functioning and development of knowledge about social innovations are put under close scrutiny. The conclusion is that the suggested disciplinary paradigm of sociology and the new concept of social innovation facilitate the explanatory approach to relevant social phenomena, the overcoming of theoretical and methodological dilemmas in sociology and the systematic building up of cumulative sociological knowledge.